メタデータ
| 項目 |
値 |
| Designation |
46P/Wirtanen |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-12-12T22:20:53.010240Z |
| Orbit solution date (soln_date, UTC) |
2024-02-21T09:51:41Z |
| Obs used |
4224 |
| NEO |
Yes |
| M1 |
16.600 |
| K1 |
4.750 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2018-12-13.0000000 |
| e |
0.65875501 |
| q (au) |
1.055355 |
| a (au) |
3.092662 |
| i (deg) |
11.747549 |
| Ω (om, deg) |
82.157634 |
| ω (w, deg) |
356.341072 |
| M (ma, deg) |
0.012474 |
等級
散乱 + 全体線形
$$
M_a = (15.091 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.091 |
| n |
2.000 |
| gf |
0.997 |
| gb |
-0.785 |
| k |
1.000 |
| δ90 |
10.000 |
| パラメータ |
記号 |
範囲 |
説明 |
| 太陽・地球距離が1 AUのときの絶対等級 |
H0 |
-5 to 20 |
彗星の固有の明るさ |
| 測光スロープパラメータ |
n |
2 to 6 |
太陽距離に対する明るさ変化率 |
| 前方散乱非対称係数 |
gf |
0.8 to 1 |
前方散乱の強さ |
| 後方散乱非対称係数 |
gb |
-1 to -0.5 |
後方散乱の強さ |
| 分配係数 |
k |
0.8 to 1 |
前方/後方散乱の寄与比 |
| ダスト/ガス明るさ比 |
δ90 |
1 to 10 |
ダスト散乱とガス放射の相対寄与 |
参考: EPSC-DPS2025-160
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
16:15:13.49 |
-17:01:43.0 |
HIP 79579 |
27.54 |
| 2026-06-01 12:00 |
16:14:50.77 |
-17:01:12.6 |
HIP 79579 |
25.55 |
| 2026-06-02 00:00 |
16:14:28.08 |
-17:00:42.4 |
HIP 79579 |
24.64 |
| 2026-06-02 12:00 |
16:14:05.45 |
-17:00:12.4 |
HIP 79579 |
24.90 |
| 2026-06-03 00:00 |
16:13:42.87 |
-16:59:42.6 |
HIP 79579 |
26.30 |
| 2026-06-03 12:00 |
16:13:20.34 |
-16:59:13.0 |
HIP 79395 |
24.77 |
| 2026-06-04 00:00 |
16:12:57.86 |
-16:58:43.7 |
HIP 79395 |
21.17 |
| 2026-06-04 12:00 |
16:12:35.45 |
-16:58:14.6 |
HIP 79395 |
18.49 |
| 2026-06-05 00:00 |
16:12:13.10 |
-16:57:45.7 |
HIP 79395 |
17.14 |
| 2026-06-05 12:00 |
16:11:50.82 |
-16:57:17.1 |
HIP 79395 |
17.41 |
| 2026-06-06 00:00 |
16:11:28.61 |
-16:56:48.8 |
HIP 79395 |
19.23 |
| 2026-06-06 12:00 |
16:11:06.46 |
-16:56:20.7 |
HIP 79395 |
22.20 |
| 2026-06-07 00:00 |
16:10:44.40 |
-16:55:52.9 |
HIP 79169 |
23.50 |
| 2026-06-07 12:00 |
16:10:22.41 |
-16:55:25.4 |
HIP 79169 |
20.18 |
| 2026-06-08 00:00 |
16:10:00.51 |
-16:54:58.1 |
HIP 79169 |
17.85 |
| 2026-06-08 12:00 |
16:09:38.69 |
-16:54:31.2 |
HIP 79169 |
16.87 |
| 2026-06-09 00:00 |
16:09:16.96 |
-16:54:04.6 |
HIP 79169 |
17.48 |
| 2026-06-09 12:00 |
16:08:55.32 |
-16:53:38.3 |
HIP 79061 |
17.11 |
| 2026-06-10 00:00 |
16:08:33.78 |
-16:53:12.3 |
HIP 79061 |
15.41 |
| 2026-06-10 12:00 |
16:08:12.33 |
-16:52:46.7 |
HIP 79061 |
15.35 |
| 2026-06-11 00:00 |
16:07:50.98 |
-16:52:21.3 |
HIP 78956 |
11.86 |
| 2026-06-11 12:00 |
16:07:29.74 |
-16:51:56.4 |
HIP 78956 |
7.59 |
| 2026-06-12 00:00 |
16:07:08.60 |
-16:51:31.8 |
HIP 78956 |
5.15 |
| 2026-06-12 12:00 |
16:06:47.58 |
-16:51:07.5 |
HIP 78956 |
6.83 |
| 2026-06-13 00:00 |
16:06:26.66 |
-16:50:43.6 |
HIP 78956 |
10.82 |
| 2026-06-13 12:00 |
16:06:05.87 |
-16:50:20.1 |
HIP 78956 |
15.40 |
| 2026-06-14 00:00 |
16:05:45.19 |
-16:49:57.0 |
HIP 78755 |
15.04 |
| 2026-06-14 12:00 |
16:05:24.63 |
-16:49:34.3 |
HIP 78755 |
10.40 |
| 2026-06-15 00:00 |
16:05:04.20 |
-16:49:11.9 |
HIP 78755 |
6.25 |
| 2026-06-15 12:00 |
16:04:43.89 |
-16:48:50.0 |
HIP 78755 |
4.23 |
| 2026-06-16 00:00 |
16:04:23.72 |
-16:48:28.5 |
HIP 78755 |
6.62 |
| 2026-06-16 12:00 |
16:04:03.68 |
-16:48:07.4 |
HIP 78755 |
10.77 |
| 2026-06-17 00:00 |
16:03:43.78 |
-16:47:46.8 |
HIP 78755 |
15.28 |
| 2026-06-17 12:00 |
16:03:24.01 |
-16:47:26.5 |
HIP 78755 |
19.87 |
| 2026-06-18 00:00 |
16:03:04.38 |
-16:47:06.8 |
HIP 78664 |
24.03 |
| 2026-06-18 12:00 |
16:02:44.90 |
-16:46:47.4 |
HIP 78664 |
25.49 |
| 2026-06-19 00:00 |
16:02:25.57 |
-16:46:28.5 |
HIP 78664 |
27.66 |
| 2026-06-19 12:00 |
16:02:06.38 |
-16:46:10.1 |
HIP 78400 |
29.19 |
| 2026-06-20 00:00 |
16:01:47.35 |
-16:45:52.2 |
HIP 78400 |
25.14 |
| 2026-06-20 12:00 |
16:01:28.46 |
-16:45:34.7 |
HIP 78400 |
21.33 |
| 2026-06-21 00:00 |
16:01:09.74 |
-16:45:17.7 |
HIP 78400 |
17.90 |
| 2026-06-21 12:00 |
16:00:51.17 |
-16:45:01.2 |
HIP 78400 |
15.06 |
| 2026-06-22 00:00 |
16:00:32.76 |
-16:44:45.1 |
HIP 78400 |
13.17 |